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计算:(1)18-(-7)(2)?8×(?6)÷45(3)(-48)×﹙-16+34-112﹚(4)3+20÷22×(-15)-12
计算:(1)18-(-7)(2)?8×(?6)÷45(3)(-48)×﹙-16+34-112﹚(4)3+20÷22×(-15)-12....
计算:(1)18-(-7)(2)?8×(?6)÷45(3)(-48)×﹙-16+34-112﹚(4)3+20÷22×(-15)-12.
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(1)18-(-7)=25;
(2)?8×(?6)÷
=48÷
=60;
(3)(-48)×﹙-
+
-
﹚
=48×
-48×
+48×
=8-36+4
=-24;
(4)3+20÷22×(-
)-12
=3+20÷4×(-
)-12
=3+5×(-
)-12
=3-1-12
=-10.
(2)?8×(?6)÷
4 |
5 |
=48÷
4 |
5 |
=60;
(3)(-48)×﹙-
1 |
6 |
3 |
4 |
1 |
12 |
=48×
1 |
6 |
3 |
4 |
1 |
12 |
=8-36+4
=-24;
(4)3+20÷22×(-
1 |
5 |
=3+20÷4×(-
1 |
5 |
=3+5×(-
1 |
5 |
=3-1-12
=-10.
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